6D Mark II Error 20

[NancyJeanS]

After using the camera wihout issue for almost 3 years I now have an ongoing problem with error code 20 regardless of the lens, Canon or otherwise. It happens with lenses I’ve used for well over a year without issue. And it happens with a fully charged Canon battery. 

The error first appeared on a hot summer afternoon when I was using a Canon 70-200mm-2.8 III. 

As the incidents increased, the shutter started slowing considerably right before the error. If I switch the camera off and on and remove and reinsert the battery I can get a few shots in before the code reappears. 

I took it took a local repair store where the shutter was replaced. Just got it back and the error 20 is still happening. Now the weather is cooler so it doesn’t seem weather temp is involved.

(I’m a new pro photographer with one camera so this has affected my income.)

(I bought the camera from Amazon and purchased the 3 yr warranty. However the company didn’t  respond to my online submission which I sent twice. I called and the person had the info I submitted and said I’d get a shipping label within 24 hours. It never came and at this point I wouldn’t send it in anyway. Don’t trust them.)

[shadowsports · Accepted solution]

Hi NancyJeanS,

Sorry to hear of the trouble.  Error 20 is a shutter or mirror issue.  I think its time for your camera to go to Canon.  You can take the camera back to the shop that repaired it, or send it to Canon where it will be repaired by persons who have the knowledge, capability and resources to correctly identify the issue.  It will come with a warranty.  I believe this is your best course of action given the issue was not resolved by the shop.  Its up to you.

[error20POST]

Old thread but will post here - perhaps will help someone. Error 20 can be triggered by a variety of conditions. One that seldom appears in forums is a battery (control voltage) rather than camera problem. I've been using a DC coupler for astrophotography. Started getting ERR 20 when using coupler only - no problem with good battery. Determined that combo DC coupler and external power supply were delivering about 12V. When external battery was swapped and proper (7-8V) was delivered via same coupler, no problems / no ERR 20. So - check your power source.

[Theallurist]

I cleaned off the terminal where the battery connects to the camera with a Q-tip and some isopropyl alcohol. I guess from having batteries in my pocket at events, some dust had ended up on the prongs. This fixed my issue with err 20.